Error iPhone "SIM card invalid" after restoring via DFU — what to do?

Problems with iPhone 6 Refurbished
After I restored from DFU when activated, POPs up this error. Before worked fine, the SIM card when you buy inserted, activated without any problems.
Yesterday my iPhone suddenly turned off and won't load ( infinite Apple). I have tried to restore via DFU, but for some reason did not go a progress bar on the iPhone (just not filled with the band). Then I started usedoil, brought - brought in DFU, tried again and the second time restored, but now this error.
What to do? Someone with stalkivalsa?
June 5th 19 at 21:48
1 answer
June 5th 19 at 21:50
hmm.. Usually such a problem if the device was previously locked

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